Here is an intersting write up about chamical warfare being wrongfully used throughout the Iran Iraq war. Both Iran and Iraq had been prohibited by the UN to use chemical warfare. Iran made allegations that Iraq had been using chemical warfare in certain instances. Iraq had disputed the claims and said they had not been using chemical warfare. However, the UN had verified that Iraq had been using illegal chemical warfare throughout the war.
http://www.iranchamber.com/history/articles/chemical_warfare_iran_iraq_war.php
